[Solved] Flickering webpage in browser window - Flickering images

Try disabling graphics hardware acceleration. You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

Click the menu button ☰ and select Options

In the Firefox Options window, click the Advanced tab, then select General.

In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.